A single-chip digitally calibrated 5.15~5.825-GHz 0.18-μm CMOS transceiver for 802.11a wireless LAN

Vassiliou, I.; Vavelidis, K.; Georgantas, T.; Plevridis, S.; Haralabidis, N.; Kamoulakos, G.; Kapnistis, C.; Kavadias, S.; Kokolakis, Y.; Merakos, P.; Rudell, Jacques C.; Yamanaka, Akifumi; Bouras, S.; Bouras, I.

doi:10.1109/jssc.2003.819086

Cited by 110 publications

(41 citation statements)

References 21 publications

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“…In addition, differential mismatches in mixer and LO generate the LO feedthrough even by a double-balanced mixer. Figure 13 shows an I/Q mismatch calibration technique using a detector [17]. The detector is used for power detection by a second-order distortion.…”

Section: I/q Mismatch Calibrationmentioning

confidence: 99%

“…Fortunately, the required bandwidth and resolution coincide with the receiver specification in a symmetric-rate wireless system such as TDD. Figure 14 shows an example implementation of TX loop-back calibration [17]. The down-converted tones by the detector are digitized through the VGA, LPF, and ADC path, and then DFT is applied to analyze each signal strength.…”

Section: I/q Mismatch Calibrationmentioning

confidence: 99%

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Digitally Assisted Analog and RF Circuits

Okada

2015

IEICE Trans. Electron.

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SUMMARY In this paper, the importance and perspective for the digitally-assisted analog and RF circuits are discussed, especially related to wireless transceivers. Digital calibration techniques for compensating I/Q mismatch, IM2, and LO impairments in cellular, 2.4 GHz WiFi, and 60 GHz WiGig transceivers are introduced with detailed analysis and circuit implementations. Future technology directions such as the shift from digitally-assisted analog circuit to digitally-designed analog circuit will also be discussed.

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Section: I/q Mismatch Calibrationmentioning

confidence: 99%

Section: I/q Mismatch Calibrationmentioning

confidence: 99%

Digitally Assisted Analog and RF Circuits

Okada

2015

IEICE Trans. Electron.

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“…Typical values of the PN power and bandwidth have been selected. The power is equal to 32 dBc and the bandwidth is equal to 200 kHz [22]. In the presence of all non-idealities, the BER floors at 3.10 −4 .…”

Section: Final Performancementioning

confidence: 99%

Impact of frequency offsets and IQ imbalance on MC-CDMA reception based on channel tracking

Horlin

Rore

Lopez-Estraviz

et al. 2006

IEEE J. Select. Areas Commun.

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New air interfaces are currently being developed to meet the high spectral efficiency requirements of the emerging wireless communication systems. Multi-carrier code-division multiple access (MC-CDMA) is seen as a promising candidate for the fourth generation (4G) cellular communication systems because it can interestingly deal with the multipath propagation at a low processing complexity. Besides spectral efficiency and power consumption, the production cost of the transceiver should also be optimized. Direct conversion radio frequency (RF) receivers are appealing because they avoid costly intermediate frequency (IF) filters. However, they imply RF IQ separation, introducing a phase and amplitude mismatch between the I and Q branches. A communication system based on MC-CDMA is sensitive to synchronization errors and front-end non-idealities because it uses a long symbol duration. The goal of this paper is to evaluate the impact of the carrier frequency offset (CFO), the sampling clock offset (SCO) and the IQ imbalance on the MC-CDMA downlink system performance, considering a receiver based on channel tracking designed to cope with high mobility conditions. It is demonstrated that part of the effects is compensated by the channel estimation and an expression of the variance of the remaining symbol estimation error is provided. For the cellular system and the target performance considered in this paper, specifications are defined on the non-idealities. The results are validated with bit error rate (BER) simulations.

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“…Typically, a phase accuracy better than 1 and an amplitude accuracy better than 1% are required to guarantee that the quadrature inaccuracy is not limiting the overall performance. In previously published work [9], [10], the required accuracy is only achievable with the help of calibration algorithms, requiring support from the baseband chip. However, as stated before, one of the main targets for this work was that the radio chip should be as independent of the baseband IC as possible.…”

Section: High-accuracy Quadrature Generationmentioning

confidence: 99%